I spend some time finding.

On the sprint tracks on South City.
then dont have anywhere to park after race.. so then they drive like drunk people and crash in walls.
Make them park there they started or something

On evry track.
When they have finished the race and going to park in the pit,
and they get crashed the way onto the pit. they just go out of the pit and suddently park in the middle of the road.

FZR on BL1r.
When i have /mustpit yes ON.
And they are going the turn rigth before the way onto pit.
they crashes
ALL Ai Crash. Test it your self!

Lx4 on BL2.
In one turn they lost controll and crashes. Test it your self!

Lx4 on BL2r.
On one jumping spot they lost controll and crashes. test it your self!

All cars on BL1r.
The car who it CLOSEST to the way out of the pit(Pitting) crashes in the speed limiter sign after he is finish pitted.

RB4 on AS Grand Prix.
In one turn they lose cotroll and crashes. Test it and u will find it.

FXO on AS Grand Prix.
It crashes at the same place as RB4
Edit: I have a video I made long time ago with FXO http://www.youtube.com/watch?v=tiZca6Ewr_8 (it does the same now)

Last turn on FE Green.
On the last turn on FE Green, these cars Drift/spins: BF1, Fo8, FZR, FBM, RB4, UF1, MRT.
They do it because they are going to pit.. they go to fast and then they Drift/spin.

Last turn on FE Gold.
On the last turn on FE Gold, these cars Drift/spins: BF1, Fo8, Fox, FZR, FBM, XFR, FZ5, LX6, Rac, XRT, XFG, XRG, Uf1.